Cylinder gauge



April 19, 1927. R. J. O. SIMPSON CYLI NDER GAUGE Filed March 8. 1923 2lSmeets-Sheen: 1

1905/527 J 0. J/NJo/v Apra w, i927.

R. J. O. SMPSON CYLINDER GAUGE Filed March 8. 1925 huez/fior. Rober?.10. Sgsonf fdorney.

Patented Api-(19,1921.

y .lJNiT-ED sTATEsfPATI-:NT OFFICE.

ROBERT J'. O. SIMPSON, OF ATHOL, MASSACHUSETTS, ASSIGNOR T0 THE L. S.lSTAB'RE'JT COMPANY, OF

ATHOL, MASSACHUSETTS, A CORPORATION OIE MASSACHUSETTS.

CYLINDER GAUGE.-

Application filed much s, 1923. serial No. 623,653.

-Thisi invention relates to dialindicators, and particularly to anindicator for gaugmg the cylinders of an internal combustion env gine todetermine the variation, if any, in the cylinder bore and visuallyindicate tothe car owner that the cylinders of his engine requireregrinding. My present invention involves certain improvements upon andrefinements over thev l0 cylinder auge disclosed in application, Se-

rial Num er 583,159, filed August 21, 1922,- to which reference is madeas illustrating a gau of the general type involvedv herein. econstruction and operation of my gauge, together with a selectedembodiment which well illustrates the principles involved,'is describedand shown in the accompanying specification .and drawings throughoutwhich like reference characters are ap- 90 plied. to indicatecorresponding parts, and

the characteristic features of novelty are particularly pointed out inlthe appended claims.

In the drawings: v Fig. 1 is an elevation partly in section of acylinder gauge in accordance with my present invention as viewed fromthe rear of the sled or frame piece.

Fig. 2 isa plan view thereof. 1 y Fi 3 is a view at right angles to Fig.1 an -illustrating thev manner of gauging a cylinder-bore,

Fig. 4 is a plan view of Fig. 3, Fig. 5 is atransverse section throughthe cylinder with'my improved gauge positioned therein and viewing thegauge from the open end of the cylinder. and Fig. 6 is av section on theline 6-6 of Fig. 5.

I have indicated at 1 the handle of a dial indicator in accordance withmy invention.

40 The up er endof the handle is preferably externa ly milled as shownin Fig. 1 to provide a convenient linger hold. The handle is hollow fora portion of. its length to constitute a receptacle 2 for an extragauging stem 17 and at its upper end is tapped and threaded to receive acap screw 3 which closes `the outer end of the hollow receptacle.

The lower end of the handle 1 is threaded Y in a bearing 4 formedcentrally of the upper cross piece of a sled or open rectangular frame 5upon which the dial indicator 6 is mounted for sliding movement in ahorizontal plane. The lower cross piece of the sled is indicated at 7and the vertical uprights 55 connecting -saidcross pieces rare indicatedThese uprights are rounded on` a radius substantially equal to thecurvature of the smallest cylinder bore to which the indicator isadaptable. v Projecting horizontally from the uprights is av pair ofspaced guide posts 9 which are disposed through horizontal sockets inthe base 6 of the Vdial indicator. Fixed in the lower cross piece 7 ofthe lsled adjacent the 65 guide posts 9 is a pair of spring plungers 10,the springs for which are indicated at 11. Slidable .centrally throughthe lower cross piece of the sled is a headed contact stud V12 which isformed integral with the base 70- of the-dial indicator. Confined withinsaid casing base is a. coil spring 14 which abuts the stud 12 at one endand at its other end abuts a horizontally sliding rackbar 15 which isguided in the base of the dial indicator casting and is alined with thestud 12.'y At its outer end the rack bar 15 is provided with-'a splitchuck 16 within which a contact stem 17 is adapted tobe inserted andclamped by a clamp nut 18. The reciprocation of the rack bar 15 istransmitted to the pointer 19 of the dial indicator as rotary moi tionby means of a gear segment 20 meshing with the teeth of the rack bar andjournaledin a split bearing 21 fast to the under side 85 of theindicator casing 22. The' gear segment 20 in turn meshes with the teethof a vertically disposed rack bar 23 mounted in said casing 22 andprovided with a transverse pin 24, one end of which is disposed in aspiral groove cut in the pointer barrel 25 and the opposite end of whichis guided in a guide 26 mounted on the casing 22. The movement of therack bar 23 towards the dial is resisted by a coil spring 27 95 anchoredwithin said casing and engaging the pin 24 .at one end.

' The rotation of the barrelv 25 is transmitted to the pointer 19through a gear train 28 whereby to rotate said pointer over' the 100graduated dial 29 of thegindicator.

In use, a contact stem 17 of the approximate roper length for thediameter of the cylin er vC to be tested is clamped 'within normallymaintaining the dial indicator away from said frame, a contact stud pro-I jectlng from the dial lndlcator between saut pair of springplungersand disposed through tact stud integral with the dial indicator hetweensaid pair of spring' plungers and disposed through the bearing of saidframe for .Contact with the cylinder wall, a rack bar alined with saidstud and slidable through 'the indicator and provided at its outer end iwith a chuck, a contact stem clamped in said chuck and adapted forcontact with thc cyl- 'inder wall at a point substantially diametrisaidbearing of said frame for'contact with the cylinder wall. a rack baralined with saidstud and slidable through the indicator, a coil springinterposed between said stud cally. opposite the point of said studcontact, a coil spring interposed between said stud andrack bar,and-lnotion transmitting conand rack bar. a contact lstein alined withsaid Y rack bar and adapted-for contact with the" cylinder wall at apoint substantially d ametrically opposite the point of said studcontact, and motion transmitting connections between said rack har andthe pointer of the dial indicator for converting the reciprocation otsaid rack barinto rotary motion applied to said pointer.

4. A cylinder gauge comprising 'an elongated bearing member adapted tobe positioned longitudinally within a cylinder and having a centralbearing for a contact stud, a pair of spaced guide posts projecting fromsaid frame, a dial indicator having a pointer and slidablev on -saidguide posts, a pair of spaced plunge-rs projecting from said framebetween said guide posts and disposed within the base of the dialindicator, coiled springs abutting said plun ers and normallymaintainingthe dial mdicator away from said frame, a contact stud integral with thedial indicator between said pair of spring plungers and disposed throughthe bearing of said frame for contact with the cylinder wall, said studhaving a .shouldered'head adapted to contact said bearing to limit themovement of said dial indicator away from said frame, a rack bar alinedwith said stud and slidable through the indicator, a coil springinterposed between said stud and rack bar, a contact stem alined withsaid rack bar and adapted for contact with the cylinder wall at a ointsubstantially diametrically opposite t e point of said stud contact, andmotion transmitting connections between .said rack bar and the pointerof the dial indicator for converting the reciprocation of said rack barinto rotary motion applied to said pointer.

5. A cylinder gauge comprising an elongated bearing member adapted to bepositioned longitudinally within a cylinder and having ,a bearing for acontact stud, a pair of spaced guide posts project-ing from said frame,a dial indicator having a pointer and slidable on said guide posts, apair of spaced vner-tions between said rack bar and the pointerof thedial indicator for converting the reci procation of said rack bar intorotary` Vniotion applied to said pointer.

6. A cylinder gaugeV comprising a handle, -a frame at one end of saidhandle and having a bearing -tor acontact stud, a dial indicator havinga pointer and ieldably mounted for sliding movement re ative to saidframe and havingv a stud movable f through said bearing of the frame forcontact with the cylinder wall, an intermediate member alined with saidlcontact stud, a spring interposed between-said'member and stud, acontact stem alined with saidintermediate member and adapted forycontact with the cylinder walll at a point substantially diametrically.opposite the point of said stud contact, and motion transmittingconnections between said member and the pointer of said .dial indicatorfor convertingplungers projecting from sald frame between said -guideposts and disposed within the dial indicator, coiled springs abuttingsaid plunger and normally maintaining the dial indicator away from saidframe, a conthe reciprocation of said member into rotary motion appliedto said pointer.

7. A cylinder gauge comprising a'frame adapted tobe positioned within acylinder and having a pair of spaced guide posts projecting therefrom, adial indicator having a pointer and yieldably mounted upon saidx guideposts for sliding movement transversely of said frame, a pair of spacedplungers projecting :from said frame adjacent said guide posts, springsinterposed between said plungers and dial indicator normally maintainingthe dial indicator away from said frame, a cylinder contact mechanismassociated with said dial-indicator and motion transmitting connectionsbetween said Contact mechanism and the pointer of the dial indicator.

8. A cylinder gauge comprising a frame'` adapted to be positioned withina cylinder and having a pair of spaced guide posts projecting therefrom,'a dial indicator having a pointer and vield'ably mounted upon saidguide posts for sliding movement transversely of .said frame, a pair ofspaced plungers projecting from said frame between and parallel to saidguide posts,

springs interposed between said plungers.

and dial indicator normally maintaining the dial indicator away fromsaid frame a cylinder wall contact associated with sai frame and acylinder wall contact associated with lou I said dial indicator, andmotion transmittin connections between one of said contacts and thepointer of the dial indicator.

S). A cylinder gauge, comprising en elongated frame adapted to bepositioned lonofitudinally within a cylinder for contact with (he wallsthereof along spaced substantially parallel lines ot hearing, a dialindicator having a pointer and mounted on said frame lor slidingmovementtransversely relative thereto. :i contact member carried by said dialindicator projecting' through said frame l'or contact with the cylinderWall intermediate ot the smid lines of frame Contact and perpendiculnrlythereto, u chuck associated with said dialindicator. a Contact memberrletnclialily clamped within said cimeli in :ilinement with saidfirst-named Contact member and adapted for contact with the cylinderwall dianietrically oppoeitely therctoand motion transmittingconnections between one of said pair of alined Contact members and thepointer of the dial indicator.

l0. A cylinder gauge comprising an elongated frame adapted to bepositioned Within a cylinder, for Contact with the walls thereof along'spaced parallel lines of bearing., a dial indicator having a pointer andyieldahly mounted on said frame tor sliding movement transverselyrelative thereto, ai

chuck associated with said dial indicator, a

ronlaet siem detachahlgr clamped within said chuck and adapted forContact with the cylinder Wall transversely of the plane of said.

lines olf frame eontact and perpendicular thereto, and motiontrnrisn'litting conneetions between said stem and the pointer of thedial indicator.

ln testimony Whereoiu adir; my signature.

noerinfr a", o. emerson

